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While the current RDA for vitamin D is 600 IU per day for adults, studies suggest that you may need to supplement around 3000 IU per day to achieve proper blood levels of vitamin D. If you think you should take a vitamin D supplement, get your vitamin D levels checked by a physician first. They will perform a 25-hydroxyvitamin D test, which
For example, beta-carotene is converted to retinol (an active form of vitamin A) in your small intestine ( 2 ). Here are 6 important health benefits of vitamin A. 1. Protects Your Eyes From Night 7yUK.